Patent US2721799A successfully refreshed from Google Patents.
US2721799A
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Sensitized photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1951-10-18
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Granted: 1955-10-25
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Expires: 1971-10-18
Abstract
No abstract record available.
Inventors
- 👤 Edwards Harry Derek
- 👤 Doyle Frank Peter
- 👤 Palling Stanley John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; C; C09; C09B; C09B23/00; C09B23/0091; C09B23/14; C09B23/16; C09B23/162; C09B23/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION SENSITIZED WITH A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF THOSE REPRESENTED BY THE FOLLOWING TWO GENERAL FORMULAS:
Claim 2
Dependent Claim
23 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION SENSITIZED WITH A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF THOSE REPRESENTED BY THE FOLLOWING TWO GENERAL FORMULAS:
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |